Which of the following plants do not have swimming sperm? ginkgos cycads both a and b none of the above

None of these.

Explanation: The plants like cycads and ginkgos have swimming sperms. they need water to complete their life cycle.

There are many adaptations seen in the plants like liveworts, ferns and mosses in which they require water to complete its life cycle. This adaptation is not only restricted upto cyptograms. This can also be seen in the plants like ginkgos and cycads. Their sperms are very strange.

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.